Participating clinics/institutions/physicians

Denmark	Copenhagen	Kjeld Schmiegelow, Karsten Nysom, Birgitte Lausen, Astrid Sehested, Marianne Ifversen, Lisa Hjalgrim, Jesper Brok, Rene Mathiasen, Bodil Als-Nielsen, Marianne Hoffmann, Mimi Kjærsgaard, Katja Harder, Ruta Tuckuviene, Sascha Wiik Michelsen, Raheel Altaf Raja, Peter Erik Lotko Pontoppidan
	Odense	Peder Skov Wehner, Eckhard Schomerus, Niels Fisker, Michael Callesen, Mathias Rathe, Dorthe Grosen, Sine Lykkedegn
	Aarhus	Henrik Hasle, Birgitte Klug Albertsen, Torben Mikkelsen, Pernille Edslev Wendtland, Karin Bækgaard Nissen, Ines Kristenen, Torjus Skajaa, Louise Lindholdt Hansen, Louise Tram Henriksen
	Aalborg	Steen Rosthøj, Christina Friis Jensen
Estonia	Tallinn	Kristi Lepik, Kadri Saks, Maarja Karu, Geerda Ainsoo, Irina Kerna, Keiu Paapsi, Kati Mädo
	Tartu	Sirje Mikkel, Lenne-Triin Kõrgvee, Ain Kaare, Pille Tammur
Finland	Helsinki	Mervi Taskinen, Kim Vettenranta, Pasi Huttunen, Jukka Kanerva, Kirsi Jahnukainen, Virve Pentikäinen, Minna Kosken- vuo, Samppa Ryhänen, Helena Olkinuora, Satu Långström, Pauliina Utriainen, Adam Alexandersson, Anu Suominen, Antti Kyrönlahti, Heljä Lång
	Turku	Päivi Lähteenmäki, Marika Grönroos, Anu Huurre, Laura Korhonen, Linnea Schuez-Havupalo, Liisa Järvelä
	Oulo	Riitta Niinimäki, Hanna Juntti, Anne Hekkala, Elli-Maija Ukonmaanaho, Henri Aarnivala
	Tampere	Olli Lohi, Mikko Arola, Susanna Vuorenoja, Päivi Raittinen, Sauli Palmu, Niina Valtanen, Kristiina Nordfors
	Kuopio	Pekka Riikonen, Kaisa Vepsäläinen, Jouni Pesola, Tuuli Pöyhönen, Stefan Becker
Iceland	Reykjavik	Ólafur G. Jónsson, Halldóra K. Thórarinsdóttir, Sólveig Hafsteinsdóttir, Ragnar Bjarnason, Jón Jóhannes Jónsson
Lithuania	Kaunas	Giedre Rutkauskiene, Rosita Kiudeliene, Egle Ramanauskiene, Sonata Argustaite, Justina Klimaite, Ruta Radaviciute, Eglė Bindokaitė, Mantas Simutis
	Vilnius	Jelena Rascon, Goda Vaitkevičienė, Gražina Kleinotienė, Audronė Mulevičienė, Indrė Tamulienė, Ramunė Pasaulienė, Rolanda Nemanienė, Sigita Stankevičienė, Sonata Šaulytė Trakymienė, Vilma Rutkauskaitė, Ignė Kairienė, Edita Rutkauskienė, Monika Kapitančiukė
Norway	Oslo	Anne Grete Bechensteen, Ellen Ruud, Heidi Glosli, Bernward Zeller, Inga Maria Johannsdottir, Einar Stensvold, Jochen Büchner, Monica Cheng Munthe-Kaas, Aina Ulvmoen, Charlotte Alme, Marta Burman, Kirsten Jarvis, Ida Knapstad, Tale Torjussen, Christina Elisabeth Bjerring Opheim, Anne Gro Wesenberg Rognlien, Ingvild Heier, Anne Vestli
	Trondheim	Bendik Lund, Ann Elisabeth Åsberg, Svein Kolmannsskog, Erling Moe, Kristin Solem, Magnus Aassved Hjort
	Bergen	Maria W Gunnes, Dorota Malgorzata Wojcik, Anita Andrejeva, Ingrid Kristin Torsvik
	Tromsø	Tore Stokland, Trond Flaegstad, Niklas Stabell, Tove Nystad, Simon Kranz, Ole Mikal Wormdal
Sweden	Stockholm, Huddinge	Mikael Sundin, Jacek Winiarski, Peter Priftakis, Kim Ramme, Petra Byström, Gauti Rafn Vilbergsson, Susan Farmand
	Lund	Anders Castor, Jacek Toporski, Lars Hjorth, Helena Mörse, Kees-Jan Pronk, Dominik Turkiewicz, Ingrid Öra, Ulf Tedgård, Annika Mårtensson, Marie Eliasson Hofvander, Johan Svahn, Patrik Romerius, Joakim Wille, Ladislav Krol, Joana Makari, Nadine Gretenkort Andersson, Anna Sällfors Holmqvist, Charlotte Ragnarsson
	Uppsala	Josefine Palle, Britt-Marie Frost, Gustaf Ljungman, Johan Arvidson, Per Frisk, Åke Jakobson, Anders Öberg, Annika Englund, Natalja Jackmann, Britt Gustafsson, Tania Christofo- raki, Arja Harila-Saari, Mia Giertz, Gustaf Leijonhufvud, Geraldine Giraud
	Gothenburg	Karin Mellgren, Jonas Abrahamsson, Gustaf Österlundh, Marianne Jarfelt, Magnus Sabel, Magnus Göransson, Cecilia Langenskiöld, Lene Karlsson, Elizabeth Schepke, Lars Kawan, Torben Ek, Cecilia Petersen, Diana Ljung-Sass, Lisa Mellström, Aron Onerup, Martin Dalin, Jerker Isaksson, Monika Renkiel- ska, Jonathan Källström
	Umeå	Ulrika Norén Nyström, Per-Erik Sandström, Caroline Björklund, Magnus Borssén, Frans Nilsson, Fredrik Bäckström
	Linköping	Mikael Behrendtz, Britt-Marie Holmqvist, Per Nyman Hartmut Vogt, Lisa Törnudd, Oskar Lundgren
The Leukemia Registry		Mats Heyman Karolinska Institutet Dept. of Women’s and Children’s Health Childhood Cancer Research Unit Tomtebodavägen 18 A SE-17177 Stockholm Sweden